package com.webserver.core;

import com.webserver.http.HttpRequest;

import java.io.*;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

/**
 * 处理与指定客户端的HTTP交互
 * HTTP交互采取一问一答,因此这里分为三步完成一次交互过程:
 * 1:解析请求
 * 2:处理请求
 * 3:响应客户端
 */
public class ClientHandler implements Runnable{
    private Socket socket;

    public ClientHandler(Socket socket){
        this.socket = socket;
    }

    public void run() {
        try {
            //1解析请求
            HttpRequest request = new HttpRequest(socket);

            //2处理请求
            //通过请求对象获取浏览器URL中的抽象路径部分
            /*
                http://localhost:8088/myweb/index.html
                http://localhost:8088/myweb/classTable.html
             */
            String path  = request.getUri();
            File file = new File("./webapps"+path);

            //3发送响应

            /*
                发送一个标准的响应,大致如下:
                HTTP/1.1 200 OK(CRLF)
                Content-Type: text/html(CRLF)
                Content-Length: 2546(CRLF)(CRLF)
                1011101010101010101......
             */
                OutputStream out = socket.getOutputStream();
                //3.1:发送状态行
                String line = "HTTP/1.1 200 OK";
                //UnsupportedEncodingException 原因:字符集名字拼写错误!
                byte[] data = line.getBytes("ISO8859-1");
                out.write(data);
                out.write(13);//written CR
                out.write(10);//written LF


                //3.2:发送响应头
                line = "Content-Type: text/html";
                data = line.getBytes("ISO8859-1");
                out.write(data);
                out.write(13);//written CR
                out.write(10);//written LF

                line = "Content-Length: "+file.length();
                data = line.getBytes("ISO8859-1");
                out.write(data);
                out.write(13);//written CR
                out.write(10);//written LF

                //单独发送CRLF表示响应头发送完毕
                out.write(13);//written CR
                out.write(10);//written LF

                //3.3:发送正文(index页面内容)
                FileInputStream fis = new FileInputStream(file);
                byte[] buf = new byte[1024*8];
                int len;
                while((len = fis.read(buf))!=-1){
                    out.write(buf,0,len);
                }

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                //交互完毕后与客户端断开链接
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }



}






